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Top Forums UNIX for Dummies Questions & Answers Deleting files based on Substring match Post 302625555 by manushi88 on Wednesday 18th of April 2012 01:47:35 AM
Old 04-18-2012
Hi neutronscott,
This will remove files according to modification time but in this scenario one can modify file at any moment. So this query will not give correct results

---------- Post updated at 12:42 AM ---------- Previous update was at 12:40 AM ----------

Hi methyl,

thanks for pointing it out the typing error.Made required change

---------- Post updated at 12:47 AM ---------- Previous update was at 12:42 AM ----------

Hi 47shailesh,

$UPPDATE is a substring having todays date pattern as filename would be somewhat like this
(eg ABS_18APR2012_XYZ.csv
DSE_17APR2012_ABE.csv)
so what I am trying to do is removing all the files other than todays date pettern

but this
Code:
ls $FILE | grep -v "$UPPDATE"

will list the files who is having todays date pattern

Last edited by Scrutinizer; 04-18-2012 at 03:03 AM.. Reason: code tags
 

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DU(1)								   User Commands							     DU(1)

NAME
du - estimate file space usage SYNOPSIS
du [OPTION]... [FILE]... du [OPTION]... --files0-from=F DESCRIPTION
Summarize disk usage of the set of FILEs, recursively for directories. Mandatory arguments to long options are mandatory for short options too. -0, --null end each output line with NUL, not newline -a, --all write counts for all files, not just directories --apparent-size print apparent sizes, rather than disk usage; although the apparent size is usually smaller, it may be larger due to holes in ('sparse') files, internal fragmentation, indirect blocks, and the like -B, --block-size=SIZE scale sizes by SIZE before printing them; e.g., '-BM' prints sizes in units of 1,048,576 bytes; see SIZE format below -b, --bytes equivalent to '--apparent-size --block-size=1' -c, --total produce a grand total -D, --dereference-args dereference only symlinks that are listed on the command line -d, --max-depth=N print the total for a directory (or file, with --all) only if it is N or fewer levels below the command line argument; --max-depth=0 is the same as --summarize --files0-from=F summarize disk usage of the NUL-terminated file names specified in file F; if F is -, then read names from standard input -H equivalent to --dereference-args (-D) -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G) --inodes list inode usage information instead of block usage -k like --block-size=1K -L, --dereference dereference all symbolic links -l, --count-links count sizes many times if hard linked -m like --block-size=1M -P, --no-dereference don't follow any symbolic links (this is the default) -S, --separate-dirs for directories do not include size of subdirectories --si like -h, but use powers of 1000 not 1024 -s, --summarize display only a total for each argument -t, --threshold=SIZE exclude entries smaller than SIZE if positive, or entries greater than SIZE if negative --time show time of the last modification of any file in the directory, or any of its subdirectories --time=WORD show time as WORD instead of modification time: atime, access, use, ctime or status --time-style=STYLE show times using STYLE, which can be: full-iso, long-iso, iso, or +FORMAT; FORMAT is interpreted like in 'date' -X, --exclude-from=FILE exclude files that match any pattern in FILE --exclude=PATTERN exclude files that match PATTERN -x, --one-file-system skip directories on different file systems --help display this help and exit --version output version information and exit Display values are in units of the first available SIZE from --block-size, and the DU_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables. Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set). The SIZE argument is an integer and optional unit (example: 10K is 10*1024). Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (pow- ers of 1000). PATTERNS
PATTERN is a shell pattern (not a regular expression). The pattern ? matches any one character, whereas * matches any string (composed of zero, one or multiple characters). For example, *.o will match any files whose names end in .o. Therefore, the command du --exclude='*.o' will skip all files and subdirectories ending in .o (including the file .o itself). AUTHOR
Written by Torbjorn Granlund, David MacKenzie, Paul Eggert, and Jim Meyering. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report du translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/du> or available locally via: info '(coreutils) du invocation' GNU coreutils 8.28 January 2018 DU(1)
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